[Fortran][gfortran] Disable is_contiguous_1 that is nonconformant

is_contiguous_1.f90 explicitly says that it is testing for an
IS_CONTIGUOUS result with zero sized array that goes against
what is required in the standard. Zero and one sized array are
contiguous, even when obtained with triplet strides that are not
ones.

Flang behavior will be standard conformant and align with ifort
and nagfor after llvm/llvm-project#68869.

So this test needs to be disable.
Move is_contiguous_3.f90 under the same comment since it is failing
for the same valid reason (except IS_CONTIGUOUS was folded at compile
time and therefore already correct with flang).

Author: jeanPerier

Fortran/gfortran/regression/DisabledFiles.cmake

@@ -2167,7 +2167,6 @@ file(GLOB FAILING_FILES CONFIGURE_DEPENDS
   io_real_boz.f90
   iostat_4.f90
   iostat_5.f90
-  is_contiguous_3.f90
   large_real_kind_1.f90
   large_unit_1.f90
   list_directed_large.f90
@@ -2497,6 +2496,10 @@ file(GLOB FAILING_FILES CONFIGURE_DEPENDS
   string_1_lp64.f90
   substr_10.f90
 
+  # Tests that expect nonconformant IS_CONTIGUOUS answers with zero size arrays.
+  is_contiguous_1.f90
+  is_contiguous_3.f90
+
   # Tests that are errors in gfortran but for which we emit adequate warnings; might need to use -pedantic to see them
   achar_3.f90
   achar_5.f90